51193231 has 4 divisors (see below), whose sum is σ = 51261264. Its totient is φ = 51125200.

The previous prime is 51193217. The next prime is 51193243. The reversal of 51193231 is 13239115.

51193231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51193231 - 2¹¹ = 51191183 is a prime.

It is a super-2 number, since 2×51193231² = 5241493800438722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51193196 and 51193205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51193211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32875 + ... + 34396.

It is an arithmetic number, because the mean of its divisors is an integer number (12815316).

Almost surely, 2^51193231 is an apocalyptic number.

51193231 is a deficient number, since it is larger than the sum of its proper divisors (68033).

51193231 is an equidigital number, since it uses as much as digits as its factorization.

51193231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68032.

The product of its digits is 810, while the sum is 25.

The square root of 51193231 is about 7154.9445141105. The cubic root of 51193231 is about 371.3107419497.

The spelling of 51193231 in words is "fifty-one million, one hundred ninety-three thousand, two hundred thirty-one".